JPS6330723B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing button contacts.

Conventionally, in order to manufacture button contacts, a contact band material 1 shown in FIG. 1a is punched out at regular intervals using a punch 2 with a flat tip to form a disc-shaped button contact material 3 as shown in FIG. 1b. Then, as shown in FIG. 1c, a ring-shaped protrusion 4 for resistance welding to the joint surface with the base material was formed on the button contact material 3 to form a button contact 5.

However, this manufacturing method is good when the material of the contact strip material 1 is solid, but in the case of composite material, it is impossible to distinguish between the front and back of the punched button contact material 3, so a ring-shaped material is formed on the joint surface with the base material. It was difficult to mold the projections 4.

For this reason, in the case of composite contact strips made of Ag-Cd and Ag, the Ag side is knurled in advance to distinguish the front and back, and in the case of composite contact strips made of Ag and NSS, heat treatment is performed in the atmosphere. The front and back sides were distinguished by coloring, but there was a problem in that the hardness of the contacts decreased due to heat treatment.

In addition, in the above-mentioned method for manufacturing button contacts, each
Since the individual button contact materials 3 were punched out and then molded, continuous molding was not possible, resulting in extremely poor productivity.

For these reasons, there has recently been a demand for automation that continuously performs the forming of the ring-shaped protrusion 4 and the punching of the button contact 5 for composite contact strip materials. Since it is difficult to spread, it requires a large amount of force and the equipment becomes large, and if punched forcibly, the material warps and the punch becomes severely damaged, so this kind of automation is not currently being used.

The present invention has been made in view of the above circumstances, and is capable of automatically forming button contacts having ring-shaped protrusions one after another while intermittently transporting a composite contact strip material, without warping or deforming the material, and without punching. The purpose is to provide a method that can be manufactured without damage.

The following will explain the method for manufacturing button contacts of the present invention based on embodiments of the present invention. As shown in FIG. 2 and FIG. Then, a plane drum-shaped escape hole 12 is bored using a punch 10 and a die hole 11.
Next, a circular depression 16 is formed in the center between the escape holes 12 on the bed 13 using a circular forming punch 15 with a tapered edge 14 on the flat end surface periphery, and a circular depression 16 is formed on both sides of the composite contact strip 1'. The edge is extended outwardly in an arc shape, and then the circular depression 16 is formed on the bed 13.
A ring with a sharp cross section is formed on the outer periphery of the circular recess 16 using a circular forming punch 19 having a ring-shaped concave groove 18 with a sharp cross section on the flat tip surface and having an inner diameter taper part with the same diameter corresponding to the taper part. At the same time as the protrusion 20 is formed, its outer circumferential plane 21 is rolled concentrically with the depression 16 to enlarge the end 22 between the relief holes 12 into a circular shape, and then a ring-shaped groove 23 with an arcuate cross section is formed on the flat tip surface. The ring-shaped protrusion 20 is finished and formed into a ring-shaped protrusion 26 having an arcuate cross section using a circular punch 24 and a die hole 25 provided with a circular punch 24 and a die hole 25. It is characterized by punching from .
In the method for manufacturing a button contact of the present invention, the drum-shaped relief holes 12 are bored at regular intervals before forming the ring-shaped protrusions 20 on the composite contact strip material.
When forming the center between the relief holes 12 with forming punches 15 and 19 to form a ring-shaped protrusion 20,
The escape hole allows the material to spread without being restricted in any way. Moreover, instead of molding all at once, 2
Since it is rolled and formed in stages, no great force is required, the composite contact strip 1' does not warp, and the forming punches 15 and 19 are not damaged. Furthermore, when finishing forming the ring-shaped protrusion 20 and simultaneously punching out the space between the relief holes 12 as a button contact, the material is not restricted in any way by the relief holes, so a large force is not required, and the composite contact can be formed. The strip material 1' does not warp, and the punch 24 and die holes 25
will not be damaged.

Although the drawing shows a method for manufacturing a button contact with a flat contact surface, when manufacturing a button contact with a spherical contact surface, a circular recess 16 is formed using a circular forming punch 15 as shown in FIG. When molding, a bed 13' having a shallow small diameter spherical groove 13'a on the top surface is used, and when forming the ring-shaped protrusion 20 and rolling the inside and outside of it at the same time, the top surface is compared with the same diameter as the rolled part. It is preferable to use the bed 13' with a deep spherical groove 13'b.

In addition, the taper 1 of the peripheral edge of the tip surface of the forming punch 15
4 is preferably about 45 degrees, and the ring-shaped groove 18 on the tip surface of the forming punch 19 preferably has an inclination angle of about 45 degrees on both sides.

Furthermore, the relief hole 12, which is drilled in the shape of an hourglass in plan view, is advantageously used as a pilot hole for intermittent transfer of the composite contact strip 1'.

As detailed above, the button contact manufacturing method of the present invention involves drilling the escape holes at regular intervals while intermittently transporting the composite contact strip material, and forming the areas between the escape holes into two
At the same time as rolling into a circular shape, a ring-shaped protrusion is formed at the same time, and then the ring-shaped protrusion is finished formed and the rolled part is punched out at the same time, so the material can be easily spread and rolled without applying excessive force. , molding and punching are performed, and there is no warping or deformation of the material and no damage to the punch.

Further, since the button contacts having ring-shaped protrusions are continuously formed and punched while the composite contact strip is intermittently transferred, the manufacturing of the button contacts is automated and productivity is significantly improved. Furthermore, since it is not necessary to color the composite contact strip material by heat treatment to distinguish the front and back sides prior to molding, there are excellent effects such as no reduction in the hardness of the contacts.

[Brief explanation of the drawing]

FIGS. 1a, b, and c are side sectional views showing a conventional button contact manufacturing method, FIG. 2 is a side sectional view showing a button contact manufacturing method according to the present invention, and FIG. A plan view taken along the line A, and FIG. 4 is a side sectional view showing a partially modified example of FIG. 2. 1'... Composite contact strip material, 10... Punch punch,
11...Dice hole, 12...Escape hole, 13...Bed, 14...Taper, 15...Forming punch, 1
6...Circular depression, 18...Ring-shaped groove, 19
... Molding punch, 20 ... Ring-shaped projection, 21
. . . Outer circumferential plane of projection, 22 . . . End between relief holes 12, 23 .

Claims (1)

[Claims] 1. While intermittently transporting the composite contact strip material, first, flat, hourglass-shaped relief holes are bored at regular intervals, then a circular depression is formed in the center between the relief holes, and then the circular depression is formed in the center between the relief holes. A ring-shaped groove with a sharp cross section is formed on the outer periphery of the circular recess using a circular forming punch, which has a ring-shaped concave groove with a sharp cross section on the flat tip surface and has an inner taper part with the same diameter as the taper part of the recess. At the same time as forming the protrusion, its outer circumferential plane is rolled concentrically with the circular depression, and then the ring-shaped protrusion is cut in cross section with a circular punch having a ring-shaped groove with an arcuate cross section on the flat tip surface. A method for manufacturing a button contact, characterized by finishing forming it into an arc shape and simultaneously punching out the ends between the escape holes, which have expanded into a circular shape, from a composite contact strip material.